:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(19, 25, 38, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-color: #6366f1;
    --accent-hover: #4f46e5;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.05) 0px, transparent 50%);
    background-attachment: fixed;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

/* Glassmorphism Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.3);
    padding: 24px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    box-shadow: 0 15px 35px 0 rgba(99, 102, 241, 0.05), 0 10px 30px 0 rgba(0, 0, 0, 0.35);
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    padding: 10px 20px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.4);
}

.btn-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    background: var(--success-color);
    color: white;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: var(--danger-color);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn:active {
    transform: scale(0.98);
}

/* Inputs & Form Controls */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    background: rgba(11, 15, 25, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 14px;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

/* Badge System */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-unpaid {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning-color);
    border: 1px solid rgba(245, 158, 11, 0.25);
}

.badge-paid {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.25);
}

.badge-expired {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Responsive Table */
.table-responsive {
    overflow-x: auto;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

.table th {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
    font-weight: 600;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.05em;
}

.table td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    vertical-align: middle;
}

.table tr:last-child td {
    border-bottom: none;
}

.table tr {
    transition: background-color 0.2s ease;
}

.table tr:hover {
    background-color: rgba(255, 255, 255, 0.01);
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stat-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-desc {
    font-size: 11px;
    color: var(--text-muted);
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.w-full { width: 100%; }
.d-flex { display: flex; }
.flex-column { flex-direction: column; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content-between: space-between; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mt-20 { margin-top: 20px; }
.p-20 { padding: 20px; }

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Sidebar Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #0f1422;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    flex-shrink: 0;
}

.sidebar-brand {
    padding: 10px 14px;
    margin-bottom: 30px;
}

.brand-name {
    font-size: 20px;
    font-weight: 800;
    color: white;
    letter-spacing: -0.02em;
}

.brand-user {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 600;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    color: var(--text-secondary);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s ease;
}

.nav-item:hover {
    color: white;
    background: rgba(255, 255, 255, 0.03);
}

.nav-item.active {
    color: white;
    background: #2563eb; /* Matches LancarPay primary blue color */
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.nav-icon {
    width: 20px;
    height: 20px;
    color: currentColor;
}

.nav-logout {
    color: var(--danger-color);
}

.nav-logout:hover {
    background: rgba(239, 68, 68, 0.1) !important;
    color: var(--danger-color) !important;
}

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.content-header {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(11, 15, 25, 0.4);
    backdrop-filter: blur(12px);
    flex-shrink: 0;
}

/* Tabs System */
.tabs-header {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
    padding-bottom: 1px;
}

.tab-btn {
    padding: 12px 18px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: white;
}

.tab-btn.active {
    color: #2563eb;
    border-bottom-color: #2563eb;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}